How-to Recalibrate your SoH.

[Scandinavian]

So Dee is saying you can see the voltage difference at low SoC hence the voltages will be similar at high SoC - hence it is Top Balanced.

I managed to complete some charging to 95% yesterday night. My Taycan and the PMCC would not work properly and I got a number of red charge errors when trying?? No idea why, whether car, PMCC or possibly power supply.

I used a Tesla mobile charger at 2.5 kW in the end which worked without any glitch.

If the balancing is done over a longer time this seems to work just fine as you can see in the graph below. All cells at the top are quite evenly charged and I think I saw a difference of 12 to 15 mV only. Even if my low level SoC show a ragged picture it now is quite even.

Did my SoH reading change? Very marginally I would say. From 89.9% to 90.4%. According to eFlow statistics my battery is 1.1 % lower than comparable cars in their experience?

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[Scandinavian]

Battery seems fine (is that a good thing to say on Friday 13th?).....but then I am a muppet.

??

 

[Scandinavian]

Ok, I'm done charging at a slow rate of 2kW.
Consumption is 97 kWh and it took 45 hours. ?

Assuming the useable battery capacity is 83kWh ("0"-100%) means I lost 14kWh.

Wow!

Actually I think the overall loss is even larger.

If your SoH is about 90% that would mean the battery would only take useable 83*0.9 = 75 kWh!

so over 20% loss!

I found somewhere with CarScanner (or eFlow) the loss in the HV charger to be 4-500 watts! If true that would be nearly 25% at 2 kW charge level. Not insignificant

 

[Dee]

I found somewhere with CarScanner (or eFlow) the loss in the HV charger to be 4-500 watts! If true that would be nearly 25% at 2 kW charge level. Not insignificant

It is known that slow chargers are very inefficient due to the lower voltage single phase (230V) and the loss of being an AC/DC converter.
It's better to have three fase @380V (11/22kW).
DC charging is the most efficient but at a cost.
I don't do DC charging though.
Like I said, I'm very curious what my battery will look like after the recal...

 

[Scandinavian]

Like I said, I'm very curious what my battery will look like after the recal..

What is your battery recall for? As usual no recall information here in France!

 

[Dee]

What is your battery recall for? As usual no recall information here in France!

ARA4: Replacing of modules due to risk of shortcircuit.
My car is 2020.
I'm curious if they replace all the modules or just the ones that are suspicious.

 

[Scandinavian]

ARA4: Replacing of modules due to risk of shortcircuit.
My car is 2020.
I'm curious if they replace all the modules or just the ones that are suspicious.

My car is also MY20 and I have not heard anything at all. But to be honest I have never had any recall or check up communication from Porsche France.

Thanks to this forum I have been able to ask for Heater recall, PCM updates and now Brake hoses recall. Not a single message from Porsche France. Or Porsche AG.

Seems like Porsche France use the Ostrich technique. Just stick your head in the sand!

 

[Dee]

My car is also MY20 and I have not heard anything at all. But to be honest I have never had any recall or check up communication from Porsche France.

Thanks to this forum I have been able to ask for Heater recall, PCM updates and now Brake hoses recall. Not a single message from Porsche France. Or Porsche AG.

Seems like Porsche France use the Ostrich technique. Just stick your head in the sand!

My friend in France has had exact the same experience...?

 

[Scandinavian]

Din not know you also dabbled with BMW Dee!


???

 

[Midlifecrisis]

I have had 2 Taycans and each one has gone up in % charge by about 1%/kWh when AC charging. So a 100% charge would take 100kWh. I think they have always done this and that it just represents charging loss due to converting from AC to DC

 

[D00notD00d]

ARA4: Replacing of modules due to risk of shortcircuit.
My car is 2020.
I'm curious if they replace all the modules or just the ones that are suspicious.

Posted elsewhere, MY2020 modules are no longer supplied. When MY2020 and later module versions are mixed there is a specific software mod.
Under ARA4 I had one module replaced on my MY2021. No range difference occurred.
The number of modules to be replaced is determined from analysis of vehicle logs.

 

[Donar]

I’m planning to charge my Taycan to 100% this evening and let it at 100% overnight to see if there will be any recalibration after balancing.

When it reaches 100%, do you need to let it plugged in? Or unplug, close and leave the car for 6,5 hours?

 

[Dee]

I’m planning to charge my Taycan to 100% this evening and let it at 100% overnight to see if there will be any recalibration after balancing.

When it reaches 100%, do you need to let it plugged in? Or unplug, close and leave the car for 6,5 hours?

It's the <0% that'll set a new low so you have to do that first.
After 100% you can unplug it and let is sit for at least 6,5 hours.

 

[Donar]

It's the <0% that'll set a new low so you have to do that first.
After 100% you can unplug it and let is sit for at least 6,5 hours.

Yes I know, but I don’t have the time at the moment to get it down to 0%, leave it for 6,5 hours, charge to 100% and again leave it for 6,5 hours. Will try that somewhere coming weeks.

For now I try just the 100% and leave overnight as per @Dr Bob post.

 

[Vim Schrotnock]

I'm attaching four plots of cell voltages, two showing the change at 100% charge after sitting overnight, and two showing the change at about 12% charge after sitting overnight. I believe this shows the 'balancing' occurs at the low charge. The low-charge graph shows a total variation of .028V at 5:56PM and a variation of .021 at 5:42AM after sitting overnight. At 100% charge, the variation remains the same at .005V both before and after sitting overnight.

I've also attached the SOH readings before and after the 'rebalancing', which are quite a puzzle to me. Each time I've gone through this procedure, the SOH has DECREASED, rather than increased as it has with my previous battery. My range is still excellent, and I'm not showing a significant change, so I'm quite puzzled.

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